[linux-2.6-block.git] / net / mac80211 / aes_ccm.c

/*
 * Copyright 2003-2004, Instant802 Networks, Inc.
 * Copyright 2005-2006, Devicescape Software, Inc.
 *
 * Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/crypto.h>
#include <linux/err.h>
#include <crypto/aes.h>

#include <net/mac80211.h>
#include "key.h"
#include "aes_ccm.h"

void ieee80211_aes_ccm_encrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
			       u8 *data, size_t data_len, u8 *mic)
{
	struct scatterlist assoc, pt, ct[2];

	char aead_req_data[sizeof(struct aead_request) +
			   crypto_aead_reqsize(tfm)]
		__aligned(__alignof__(struct aead_request));
	struct aead_request *aead_req = (void *) aead_req_data;

	memset(aead_req, 0, sizeof(aead_req_data));

	sg_init_one(&pt, data, data_len);
	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
	sg_init_table(ct, 2);
	sg_set_buf(&ct[0], data, data_len);
	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_assoc(aead_req, &assoc, assoc.length);
	aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);

	crypto_aead_encrypt(aead_req);
}

int ieee80211_aes_ccm_decrypt(struct crypto_aead *tfm, u8 *b_0, u8 *aad,
			      u8 *data, size_t data_len, u8 *mic)
{
	struct scatterlist assoc, pt, ct[2];
	char aead_req_data[sizeof(struct aead_request) +
			   crypto_aead_reqsize(tfm)]
		__aligned(__alignof__(struct aead_request));
	struct aead_request *aead_req = (void *) aead_req_data;

	memset(aead_req, 0, sizeof(aead_req_data));

	sg_init_one(&pt, data, data_len);
	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
	sg_init_table(ct, 2);
	sg_set_buf(&ct[0], data, data_len);
	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);

	aead_request_set_tfm(aead_req, tfm);
	aead_request_set_assoc(aead_req, &assoc, assoc.length);
	aead_request_set_crypt(aead_req, ct, &pt,
			       data_len + IEEE80211_CCMP_MIC_LEN, b_0);

	return crypto_aead_decrypt(aead_req);
}

struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
{
	struct crypto_aead *tfm;
	int err;

	tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
	if (IS_ERR(tfm))
		return tfm;

	err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
	if (!err)
		err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
	if (!err)
		return tfm;

	crypto_free_aead(tfm);
	return ERR_PTR(err);
}

void ieee80211_aes_key_free(struct crypto_aead *tfm)
{
	crypto_free_aead(tfm);
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2003-2004, Instant802 Networks, Inc.
	3	* Copyright 2005-2006, Devicescape Software, Inc.
	4	*
7ec7c4a9 AB	5	* Rewrite: Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
7ec7c4a9 AB	6	*
f0706e82 JB	7	* This program is free software; you can redistribute it and/or modify
	8	* it under the terms of the GNU General Public License version 2 as
	9	* published by the Free Software Foundation.
	10	*/
	11
172589cc	12	#include <linux/kernel.h>
f0706e82 JB	13	#include <linux/types.h>
	14	#include <linux/crypto.h>
	15	#include <linux/err.h>
0cd20a27	16	#include <crypto/aes.h>
f0706e82 JB	17
f0706e82 JB	18	#include <net/mac80211.h>
2c8dccc7	19	#include "key.h"
f0706e82 JB	20	#include "aes_ccm.h"
f0706e82 JB	21
7ec7c4a9 AB	22	void ieee80211_aes_ccm_encrypt(struct crypto_aead tfm, u8 b_0, u8 *aad,
7ec7c4a9 AB	23	u8 data, size_t data_len, u8 mic)
f0706e82	24	{
7ec7c4a9	25	struct scatterlist assoc, pt, ct[2];
f0706e82	26
6e1ee5d2 JSM	27	char aead_req_data[sizeof(struct aead_request) +
	28	crypto_aead_reqsize(tfm)]
	29	__aligned(__alignof__(struct aead_request));
	30	struct aead_request aead_req = (void ) aead_req_data;
	31
	32	memset(aead_req, 0, sizeof(aead_req_data));
f0706e82	33
7ec7c4a9 AB	34	sg_init_one(&pt, data, data_len);
	35	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
	36	sg_init_table(ct, 2);
	37	sg_set_buf(&ct[0], data, data_len);
	38	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
f0706e82	39
6e1ee5d2 JSM	40	aead_request_set_tfm(aead_req, tfm);
	41	aead_request_set_assoc(aead_req, &assoc, assoc.length);
	42	aead_request_set_crypt(aead_req, &pt, ct, data_len, b_0);
f0706e82	43
6e1ee5d2	44	crypto_aead_encrypt(aead_req);
f0706e82 JB	45	}
f0706e82 JB	46
7ec7c4a9 AB	47	int ieee80211_aes_ccm_decrypt(struct crypto_aead tfm, u8 b_0, u8 *aad,
7ec7c4a9 AB	48	u8 data, size_t data_len, u8 mic)
f0706e82	49	{
7ec7c4a9	50	struct scatterlist assoc, pt, ct[2];
6e1ee5d2 JSM	51	char aead_req_data[sizeof(struct aead_request) +
	52	crypto_aead_reqsize(tfm)]
	53	__aligned(__alignof__(struct aead_request));
	54	struct aead_request aead_req = (void ) aead_req_data;
7ec7c4a9	55
6e1ee5d2	56	memset(aead_req, 0, sizeof(aead_req_data));
7ec7c4a9 AB	57
	58	sg_init_one(&pt, data, data_len);
	59	sg_init_one(&assoc, &aad[2], be16_to_cpup((__be16 *)aad));
	60	sg_init_table(ct, 2);
	61	sg_set_buf(&ct[0], data, data_len);
	62	sg_set_buf(&ct[1], mic, IEEE80211_CCMP_MIC_LEN);
	63
6e1ee5d2 JSM	64	aead_request_set_tfm(aead_req, tfm);
	65	aead_request_set_assoc(aead_req, &assoc, assoc.length);
	66	aead_request_set_crypt(aead_req, ct, &pt,
7ec7c4a9 AB	67	data_len + IEEE80211_CCMP_MIC_LEN, b_0);
7ec7c4a9 AB	68
6e1ee5d2	69	return crypto_aead_decrypt(aead_req);
f0706e82 JB	70	}
f0706e82 JB	71
7ec7c4a9	72	struct crypto_aead *ieee80211_aes_key_setup_encrypt(const u8 key[])
f0706e82	73	{
7ec7c4a9 AB	74	struct crypto_aead *tfm;
7ec7c4a9 AB	75	int err;
f0706e82	76
7ec7c4a9 AB	77	tfm = crypto_alloc_aead("ccm(aes)", 0, CRYPTO_ALG_ASYNC);
	78	if (IS_ERR(tfm))
	79	return tfm;
f0706e82	80
7ec7c4a9 AB	81	err = crypto_aead_setkey(tfm, key, WLAN_KEY_LEN_CCMP);
	82	if (!err)
	83	err = crypto_aead_setauthsize(tfm, IEEE80211_CCMP_MIC_LEN);
	84	if (!err)
	85	return tfm;
f0706e82	86
7ec7c4a9 AB	87	crypto_free_aead(tfm);
7ec7c4a9 AB	88	return ERR_PTR(err);
f0706e82 JB	89	}
f0706e82 JB	90
7ec7c4a9	91	void ieee80211_aes_key_free(struct crypto_aead *tfm)
f0706e82	92	{
7ec7c4a9	93	crypto_free_aead(tfm);
f0706e82	94	}